Drink and party endlessly wearing skirt (7)
I believe the answer is:
martini
'drink' is the definition.
(I know that Martini is a Vermouth)
'party endlessly wearing skirt' is the wordplay.
'endlessly' indicates the central letters (the ends of the words are removed).
'wearing' indicates putting letters inside.
'skirt' becomes 'mini' (a mini skirt).
The centre of 'party' is 'art'.
'art' going into 'mini' is 'MARTINI'.
'and' acts as a link.
(Other definitions for martini that I've seen before include "James Bond's drink of choice" , "Cocktail of gin and dry vermouth" , "Gin or vodka with dry vermouth" , "In glass, one's dry" , "obtained from a bottle" .)